Tim McGraw, Faith Hill Sing in D.C. on Earth Day

Tim McGraw and Faith Hill sang in observance of Earth Day on Sunday (April 22) at George Washington University in Washington, D.C., joining Sheryl Crow, Carole King, Robert F. Kennedy Jr., Seinfeld co-creator Larry David and his activist wife, Laurie David. The concert was the last date on the Stop Global Warming college tour which featured Crow and Ms. David, who was also a producer of the Oscar-winning documentary, An Inconvenient Truth.